砥砺 (砥礪) dǐ lì

dǐ lì phrase smooth and coarse whetstones
Domain: Modern Chinese 现代汉语
Notes: Figuratively, to hone; to temper; to encourage (CC-CEDICT '砥礪'; Guoyu '砥礪'; Mathews 1931 '砥礪', p. 132)

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